Coating feed mechanism for gate rolls



y 22, 1952 H. B. RICHMOND EIAL 2,604,067

COATING FEED MECHANISM FOR GATE ROLLS 5 Sheets-Sheet 1 Filed Aug. 12, 1950 INVENTORS A Haward B. Richmond Robert W. 'Morfensen ATTORNEYS July 22, 1952 B. RICHMOND ETI'AL 2, 0

COATING FEED MECHANISM FOR GATE ROLLS FIG. 2.

INVENTORS. Howard B. Richmond v. Roberf W Morfensen B I 941/1 esnumd film/(w ATTORNEYS y 22, 1952 H. B. RICHMOND ETAL 2,604,067

COATING FEED MECHANISM FOR GATE ROLLS Filed Aug. 12, 1950 5 Sheets-Sheet 3 FIG.3.

ATTORNEYS FIG.5.

| 88 ism 86 42 26 3 44 95 9 9% 37 I INVENTORS. 37 H Howard B. Richmond I \\\I L g r Robert muomnsen av:

87 9%, sis mend, pan/Wu y 22, 1952 H. B. RICHMOND EI'AL 2,604,067

comma FEED MECHANISM FOR GATE ROLLS 5 Sheets-Sheet 4 Filed Aug. 12, 1950 FIG.6.

INVENTORS:

Howard 8. Richmond Robert W. Morfensen ATTORNEYS July 22, 1952 H. B. RICHMOND ETAL ,6 ,067

COATING FEED MECHANISM FOR GATE. ROLLS 5 Sheets-Sheet 5 Filed Aug. 12, 1950 I43 "7) $5 I26 I27 INVENIORS. Howard B. Richmond Robert W Morfensen S m 1 mm,

ATTORNEYS Patented July 22, 1952 UNITED STATES PATENT. OFFICE COATING FEED MECHANISM FOR GATE ROLLS Howard B. Richmond and Robert W. Mortensen,

Wisconsin Rapids, Wis, assignors to Consolidated Water Power & Paper 00., Wisconsin Rapids, Wis., a corporation of Wisconsin Application August 12, 1950, Serial No. 179,076

' (o1. lie-259) 10 Claims. 1

This invention relates to improvements in apparatus for the roll coating of paper, and refers particularly to means for uniformly feeding coating material to the nip of gate rolls employed in the coating apparatus.

In apparatus for applying mineral coating material to the surface. of paper to improve the printing quality of the paper, such as that shown and described in Massey et al. Patents Nos. 2,105,488, January 18, 1938, and 2,105,981, January 18, 1938, gate rolls are employed to supply the mineral coating suspension to the coatingapplying rolls. The gate rolls comprise essentiallytwo juxtaposedrolls having a nip in which a bath of coating material is maintained. During operation, the rolls are rotated and their relative speed is varied to controllably feed coating material forwardly to the coating-applying rolls.

An important feature of the present invention resides in means for feeding mineral coating material to the nip of the gate rolls in such manner as to uniformly distribute the coating material through the length of the nip. v

Briefly described the invention comprises means, for continuously carrying a coating material feed pipe forwardly and backwardly along substantially the entire length of the nip where by a stream of coating material is fedto the nip throughout its length. v I

In a specific form of the present invention a carrier is contemplated which moves in'a reciprocating manner. parallel to the nip, said carrier having a coating material feed pipe mounted thereon, together with means for moving the carrier characterized in that the driving means therefor is Operated in only one direction While the carrier continuously reverses its direction of motion. Z

Other objects, advantages and importantfeatures of the invention will, be apparent from the accompanying drawings and following detailed description.

In the drawings.

Fig. 1 is a side elevational view'illustrating our invention employed in conjunction with conventional gate rolls". n v

Fig. 2 is an end elevational view of the device shown in Fig.1. a I

Fig. 3 is a detailed enlarged view oi'thec arrier for the coating material feed pipe.

Fig. 4 is a detailed sectional view taken on line l-.-.flofFig.3.

Fig. 5 is a detailed plan sectional view taken on line 5'- -5 ofFig. 3.

Fig. 6 is an enlarged sectional view of the carrier taken on line 6-45 of Fig. 3.

Fig. '7 is a side elevational viewoi a modification of the present invention.

Fig. 8 is a transverse Se tional view taken on line 88 of Fig. '7. r

Fig. 9 is a fragmentary sectional-view taken on line 9-9 of Fig. 8. I

Referring in detail to the drawings, I and? indicate a pair of gate rolls which arejournaled in bearings 3 at opposite ends thereof. The bearings 3 are carried by arms 4', only one pair of which are shown, said-arms, there being four of them, being journaled on opposite frame members 5, only one of which is shown. The arran ement is such that rolls I and, 2 may be brought together in a controlled manner to provide a nip 6 which is adapted to carry a, quantity of coating material. The arms 4 have extens sions 1 above the bearings 3 and an adjusting screw 8 is pivotally secured at each of its ends to the extension I whereby the rolls I, and-2 may be maintained in a desired relationship with respect to each other. I

The gate rolls I and 2 comprise a portion of a paper coating machine, such as that more fully described in the patents hereinbefore identified. The roll I is maintained in contact withiroll 9 which comprises one, of the distributing rolls of the coating machine. The frames 5- are pivotally mounted upon supports I0 :whereby the frames carrying the rolls I and 2 may be rocked about .the pivotzshait II. In this fashion roll I may be brought to the desired contiguous relationship with the distributing roll'9. Frame 5'is provided with; an extension l2 which is pivotally connected to a piston rod I3 operating in a fluid pressure cylinder l4. Thepressure cylinder I4 is journaled, as at I5 in Fig. 2, upon a support I6. The arrangement is such that by' the manipulation of the piston rod [3 the frames 5' may be rocked. to bring gate roll I into contact With'th distributing roll 9. In this fashion coating material which may be carried-in the nip 6 may be transferred from said nip by means of gate roll I to the distributing roll 9 whereby said material is eventually transferred to the coating applying roll (not shown). of the coating'machine. In practice, the rolls I and 2 are rotated at scontrolled speed with respect'to eachother whereby thequantity of-coating material passed fromthe surface of gate roll 'I' to the distributihgroll-"Q iscontrolled. 7

Positioned beneath the gate rolls}! and? and spaced from each other is-a' pair-of sup porting blocks I! which may be secured to a suitable supporting foundation iii. A channel beam I9 is secured at each of its ends by means of bolts 28 or the like to the blocks l1. As will be hereinafter more fully described, the beam l9 comprises the runway or track which supports the carrier. The beam [9 is disposed parallel to the longitudinal axes of the rolls and 2.

The :beam |9 is of channel iron form having an upper flange and a lower flange 2| upon which a carrier 22 is movably supported. The carrier 22 comprises a frame 23 having divergently extending arms 24. Carried at the outer ends of the two upper arms 24 are bearing housings 25 and similarly carried at the outer ends of the two lower arms are bearing housing 26.

A roller 21 is mounted upon each of the bearing housings 25, said roller having a shaft 28 of relatively restricted diameter. The restricted shaft 28 is positioned within the housing 25 and is rotatably supported therein by ball bearing assemblies 29. A nut 39 is threadedly positioned upon the end of the shaft 28 and confines the ball bearing assemblies in proper position upon the shaft within the housing. The bearing housing 25 carries a closure plate 3| which may be secured to the housing by means of screws 32 or the like. A conventional grease gun nipple or fitting 33 is positioned upon the plate 3| whereby the ball bearings carried within the housing may be lubricated. The roller 21 projects from the housing 25 and is adapted to ride upon the upper surface of the upper flange 29' of the beam l9.

The housings 26 are substantially similar in construction to the housings 25, each housing 26 rotatably supporting a roller 34 which is adapted to ride upon the lower face of the lower flange 2| of the beam l9. Each of the housings 26, however, i provided with a relatively flat seating face 35 at its upper side which is adapted to support a bracket 36 secured to the housing 26 by means of a screw 31. A pin 38 is positioned in an aperture in bracket 36 and projects into the seat portion 35 of the housing whereby rotary movement of the bracket 36 upon the housing 26 is prevented.

A shaft 39 is carried by an upstanding portion 40.0f each bracket 36, each shaft bein embraced by a sleeve bearing 4|. Roller 42 is rotatably positioned upon the shaft 39. The purpose of the roller 42 will be hereinafter more fully described. Shaft 39 is secured to the upstanding portion of the bracket 36 by means of a nut 43 and a conventional grease gun fitting 44 connects into the end of the shaft whereby the bearings 4| may be lubricated.

A bearing housing 45 is mounted in an apertu're 46 provided adjacent one end of the beam The bearing housing 45 carries ball bearingassemblies 41 which function as frictionless bearings for shaft 48. The shaft 48 rojects from the bearing housing at one end and terminates in a tapered seat 49 which carries a hub 59. The end of the tapered portion 49 of the shaft 48 is threaded and a nut 5| functions to secure the hub 50 upon the tapered seat 49.

A nut 52 threadedly engages a portion of the shaft 48 which is confined within the housing 45 whereby the :ball bearin assemblies 41 are retained in proper position within the housing; A closure 53 is mounted upon the housing 45 and is secured thereto by means of screws 54 or the like. aperture 55 through which an extension 56 of The closure 53 is provided with a central shaft 48 projects. A hub 51 is mounted upon the projecting portion 56 and is secured thereto by means of set screw 58 and key 58. A sprocket wheel 59 is secured to an annular flange 68 formed integral with the hub 51 by means of screw 6| or the like.

Adjacent an end of the beam IS an electric motor 62 is mounted upon a suitable foundation 63. A speed reducing mechanism 64 is operatively associated with the motor 62, the output shaft 65 of the speed reducer 64 carrying a sprocket Wheel 66. A sprocket chain 81 is trained around the sprocket wheel 66 and is also trained around sprocket wheel 59. The motor 62 and speed reducer 64 are mounted upon a slidable plate 68 whereby the chain 61 may be brought to a desired degree of tension :by means of set screw 69. As can readily be seen, operation of the motor 62 results in rotary movement of the sprocket wheel 59 and inasmuch as said wheel is rigidly secured to shaft48 the tapered portion 49 of said shaft together with the hub 50 carried thereon is also rotated.

The hub 50 carries two spaced annular flanges l9 and a sprocket wheel H is secured to each of the flanges by means of screws or the like 12. A sprocket chain 13 is trained around each of the sprocket wheels H and is hence driven when the shaft 48 is rotated by motor 62.

Adjacent the opposite end of the beam |9 a bearing plate 13' is mounted, said plate being secured to the web of the beam l9 by means of screws 14 or the like which pass through slots 15 provided in the plate 13. A bearing housing (not shown) similar to'the housing 45 is carried upon the plate 13, said housing, in turn, carrying a shaft 16 similar to shaft 48 with the exception that the shaft 16 does not carry an extension corresponding to the extension '56 upon the shaft 48. However, the shaft 16, similar to shaft 48 carries a tapered seat 49 upon which a hub 11 is positioned, the hub carrying a spaced pair of sprocket wheels'18 similar to the sprocket wheels carried by hub 50. A set screw 19 threaded in a lug 99 carried upon the web of beam l9 functions to longitudinally adjust the bearing plate 13' along the length of beam I9. The sprocket chains 13 are also trained around sprocket wheels 18 and hence manipulation of the set screw 19 functions to tighten the sprocket chains 13. Intermediate the length of the beam l9 and positioned between the sprocket chains '|3 are a plurality of idler sprocket wheels 8| which function to maintain the sprocket chains 13 in desired spaced relationship with respect to each other.

A pair of lugs 82 are carried upon opposite links of the sprocket chains 13, each of said lugs having a supporting face upon which a bearing member 83 is carried. The bearing member 83 functions as a support for shaft 84 upon which roller 85 is mounted. It can readily be seen that when motor 62 is operated chains 73 are driven around the sprocket wheels 1| and 18 and the roller 85 is carried by the chain, the roller moving longitudinally forwardly and backwardly along the length of the beam l9.

A bracket 86 is supported by frame 23 being secured thereto by screws 81 or the like. The end of the bracket is bifurcated as indicated at 88 in Figs. 3 and 6. Two such brackets are mounted upon the frame 23, said brackets and the bifurcated arms being in substantial vertical alignment with each other and spaced from each other upon said frame. In the operation of the aeoaoev device roller 85 carried. by the, twin chains positionsitself in one or the. other of the forks,88,. During the upper pass of-the roller 85,, said roller is positioned in the upper forkand in the lower pass of the roller, said roller is positioned in the lower fork. By virtue of the fact. that the roller positions itself in one. of the forks, movement of the. twin chains results. in movement of the carrier,22, said carrier moving along'the length of the beam 19 in the direction that the. roller 85; moves. In other words, when the roller 85 moves through its upper pass the. carrier 22 is. moved to the left, as viewed in Figs. 1 and. 3.. When the roller 85 moves thtrough its lower P358. the carrier is moved to the right as, viewed inthese figures. When, however, the carrier moves to its extreme position either to the left or to the right, the roller 85. passes around one or the, other pair of sprocket wheels H or 1.8,. In moving around the'sprocket wheels, the roller leaves one fork 88 and enters the vertically aligned fork. In this fashion the roller alternately engages the upper and lower fork, moving the carrier in one direction or the other and changing fork engagement.

at the extreme ends of the travel of the carrier.

As one of the features of the present invention a pair of brackets 89 are mounted in spaced relationship upon the beam I9, each bracket being secured to the web of the beam by means of screws or bolts 90 which engage'in slots 9! provided in the Web of the beam. The brackets 89 are disposed in alignment with eachother and in alignment with the shafts 48 and "i5 and are positioned in spaced relationship longitudinally of the beam so as to limit the travel of the carrier in both directions. Each bracket carries an annular extending portion 92 upon which a per-. manent magnet 9.3 is carried, said permanent magnet being secured to the angularly extending plate 92 by means of bolts or the like 94. The operative faces of the permanent magnets 93 face each other and are so positioned as to make contact with the opposite sides of the. frame 23 as said frame is moved to its extreme right or left position. The frame 23 carries an abutment plate 95, on each side thereof, said'plate bein constructed of ferro-magnetic. material and functioning to offera planar surface for good magnetic contact with the operative faces of the magnets 93. The arrangement is such that when roller 85 moves the carrier 22 to its extreme right or left position the abutment. plate 95 on one or the other side of the frame 23 is brought into contact with an operative face of one or the other magnet and by magnetic attraction said frame is maintained in this position while the roller disengages itself from one of the forksBB. and engages itself with the opposite fork. Hence; during movement of the carrier 22 the carrier is under the control of the roller 85 and moves therewith. When the roller disengages' itself from one of the forks 88 it does so at aperiod of operation when the carrier is maintained stationary by the attractive force of one-of the magnets. Consequently, the roller 35 moving around one or the other pair of sprocket wheels 1 I. or it readily positions itself in the opposite fork since the carrier ismaintained stationary by the an tractive force of the magnets;

A hollow casting 96 is mounted upon the lower portion of the frame 23 being secured thereto by means of screws '91, or. the like. A nipple 9 g threadedly positionedin the castingsli and funnetions to, connect the hollow: interior. thereof --;with;

a flexible hose or conduit 99. The opposite end of the casting 9B is provided with an annular flange I00 which is secured to a companion flange l0! carried upon a vertically-disposed pipev 102, said flanges being secured together by means of cap screws N13. The pipe I62 extends upwardly from its flanged connection and is bent around and above roll 2 as shown best at H14 in Fig. 2,. The pipe I92 carries. at itsupper end an L .pipe coupling Hi5. which opens immediately above the nip 6. between rolls l and 2. V

In operation the flexible hose or conduit 99 is connected to a suitable source of coating material under pressure. Coating-material is. thus trans-. ferred into the. casting 95 and-thence upwardly through pipe 182 and i discharged into the, nip 6. When the motor 62 is in operation the twin chains 13 are moved thereby moving, roller 85. Roller 85. engages in one or the. other forks 88,

depending upon the direction of motion of the.

chain and functions to -move the] carrier from one extreme position to the opposite extreme position at which timev the roller disengages itself fromthe engaging fork and moves to the opposite fork. Continued movement of the twin, chains then results in opposite movement of the carrier 22,. During the dwell of the carrier 22 at its extreme position and while the roller is disengaging itself from one fork and en ging the other fork, thecarrier is maintained stationary by the attractive force. of one or the other of the magnets Eli. Qfjeolirse, the attractive force of the magnet is overcomeby the engagement of they rollerand; onev of the works. 88 so that after such engagement the carrier may be readily pulled from. one or the other of its extreme posi tions. During movement of, the carrier lengthwise along the beam !9 the. discharge. end of the pipe [02 moves longitudinally along. theflength of the nip. 5 and coating material discharged from the pipe is therebyuniformly distributed backwardly and forwardly along the length of said nip. In this fashion a pool of coating material is maintained in the nip 5 which is of substantially uniform depth throughout the entire coating operation.

In order to protect thecarrier and'the associatedmechanism connected therewith from coating material or othen'foreign matter which may be splashed upon the mechanism, a cover I96 may embrace the upper portion and the side portions of the device. a The cover may comprise an upwardly extending panel- IE3? secured to beam l9-by means of cap screws l 88 or the like. A top panel 109 may be connected to the side panel ID? bymeans of angle iron H0 and said top panel may be, in turn, connected to a downwardly ex t'reirgding side panel ill by means of angle iron material which may be splashed from the gate rolls will be prevented from injuring the carrier 22 and its associated mechanism. 1

During movement of the carrier 22 forwardly and backwardly along the beam lfl'rollers 42 function to support the chains H: at their lower passes, preventing said chains from sagging.

Referring particularly to. Figs. .7, '8 and 9 a beam H3 may be mounted at opposite ends upon supporting members Ht; which intu'rn may-be. carried upon a suitable foundation 1,15. T The beam tit. may be disposed; in :a "position relative By the provision of the cover H36 coating journaled.

The bearing II'I may comprise a housing II9 within which a ball bearing assembly I may be positioned. The housing II9 carries a cover plate I2I which is provided with a central aperture I22 through which an extension I23 of the screw member H8 is positioned. At the end of the extension I23 exteriorly of the bearing housing II9 a bevel gear I24 may be carried which meshes with a companion bevel gear I25 mounted upon shaft I26. Shaft I26 may carry a sprocket wheel I21 over which a sprocket chain I28 is trained. Sprocket wheel I28 may also be trained around a companion sprocket wheel which may comprise the output shaft of a suitable prime mover (not shown).

The arrangement is such that movement of the sprocket chain I28 rotates bevel gear I25 which in turn rotates bevel gear I24 thereby rotating the double threaded screw IIB. Bearing II 6 may be similar to bearing I I! except that the cover plate I29 is not apertured.

A carrier member I30 embraces the double threaded screw II8, said carrier member comprising a block I3I having a central aperture I32. A sleeve I33 may be positioned in the aperture I32 and is adapted to circumscribe the screw I I8. A pin I34 is mounted in the body of the block I 3I and terminates in a restricted portion I35. A substantially oval follower member I36 may be pivotally mounted upon the restricted end I35 of pin I34. Spacer members I 31 may be positioned upon the web of the beam H3 and may carry a pair of oppositely disposed tracks or guide plates I38. The block I3I is provided with opposite slots I 39 in which extending portions of the tracks I38 engage.

The arrangement is such that the follower member I36 engages in the threads of the screw I I 8 and when the screw is rotated the carrier I30 moves longitudinally along the length of the screw. By the provision of the guides I38 the carrier I30 is prevented from rotating with the screw II8.

A hollow casting I40 is carried upon an angle member I4I which in turn is secured to the bottom portion of the carrier I30. A nipple I42 functions to connect'the interior of the hollow casting I40 with a flexible conduit (not shown) through which a coating material may be introduced into the hollow casting from any suitable source of coating material under pressure (not shown). A pipe I43 having a flange I44 may be connected to flange I45 carried by the casting I40, the pipe I43 being substantially identical in construction with the pipe I02 hereinbefore described and the outlet of said pipe being positioned immediately above the nip 6 between the pair of gate rolls I' and 2.

In the operation of this form of our invention rotation of the screw II8 results in longitudinal reciprocatory motion of the carrier 30 whereby the pipe I43 is carried backwardly and forwardly along the length of the nip 6. In this fashion coating material is discharged into the nip Ii and a bath of coating material of substantially uniform depth is maintained in said nip.

It'is apparent that herein is provided a relatively simple, rugged mechanism which may be readily employed with existing coating machines, the present device functioning to maintain a, uniform, depth of coating material in the nip of the Y conventional gate rolls, whereby a more uniform transfer of coating material from the gate rolls to the coating material applying rolls is obtained.

We claim as our invention:

1. A device for uniformly distributing a liquid coating suspension along the length of a nip between two gate rolls of a coating machine which comprises, a track disposed substantially parallel to the length of said gate rolls, a carrier positioned upon said track for movement thereon,

means disposed adjacent and parallel to said track for moving said carrier forwardly and backwardly on said track, means for driving said carrier-moving means, and a, coating material conduit mounted upon said carrier having its discharge end disposed above said nip to discharge coating material into said nip when the carrier is moved.

2. A device for uniformly distributing a liquid coating suspension along the length of a nip between two gate rolls of a coating machine which comprises, a track disposed substantially parallel to the length of said gate rolls, a carrier positioned upon said track for movement thereon, means disposed adjacent and parallel to said track for moving said carrier forwardly and backwardly on said track, unidirectional means for driving said carrier-moving means, and a coating material conduit mounted upon said carrier having its discharge end disposed above said nip to discharge coating material into said nip when the carrier is moved.

3. A device for uniformly distributing a liquid coating suspension along the length of a nip between two gate rolls of a coating machine which comprises, a track disposed substantially parallel to the length of said gate rolls, a carrier positioned upon said track for movement thereon, endless chain means disposedadjacent and parallel to said track for moving said carrier forwardly and backwardly on said track, means for driving said chain means, and a coating material conduit mounted upon said carrier having its discharge end disposed above said nip.to discharge coating material into said nip when the carrier is moved.

4. A device for uniformly distributing a liquid coating suspension along the length of a nip between two gate rolls of a coating machine which comprises, a track disposed substantially parallel to the length of said gate rolls, a carrier positioned upon said track for movement thereon, screw means disposed adjacent and parallel to said track for moving said carrier forwardly and backwardly on said track, means for rotating said screw means, and a coating material conduit mounted upon said carrier having its discharge end disposed above said nip to discharge coating material into said nip when the carrier is moved.

5. A device for uniformly distributing a liquid coating material suspension along the length of the nip between two gate rolls of a coating machine which comprises, a track disposed substantially parallel to the length of said gate rolls, endless driving means disposed adjacent said track and having two parallel passes disposed substantially parallel to said track, a carrier positioned upon said track for movement thereon, engaging means carried by said driving means for detachable engagement with said carrier, said engag ng means engaging and moving said carrier with the driving means when said engaging means moves through said two passes, and a coating material conduit carried by said carrier having its discharge end positioned above 9 said nip to discharge coating material along the length of the nip.

6. A device for uniformly distributing a liquid coating material suspension along the length of the nip between two'gate rolls of a coating machine which comprises, a track disposed substantially parallel to the length of said gate rolls, endless driving means disposed adjacent said track and having two parallel passes disposed substantially parallel to said track, said endless driving means comprising an endless chain, a carrier positioned upon said track for movement thereon, engaging means carried by said driving means for detachable engagement with said carrier, said engaging means engaging and moving said carrier with the driving means when said engaging means moves through said two passes, and a coating material conduit carried by said carrier having its discharge end positioned above said nip to discharge coating material along the length of the nip.

7. A device for uniformly distributing a liquid coating suspension along the length of a nip between two gate rolls of a coating machine which comprises, a track disposed substantially parallel to the length of said gate rolls, an endless chain disposed adjacent said track and having two parallel passes disposed substantially parallel to said track, wheels over which said chains are trained at the ends of said passes, a carrier positioned upon said track for movement thereon, engaging means carried by said chain, a pair of spaced engaging means upon said carrier for alternate engagement with said chain engaging means, said chain engaging means breaking engagement with one of said carrier engaging means and making engagement with the other carrier engaging means at the end of each pass whereby said carrier is moved forwardly and backwardly upon said track, and a coating material conduit mounted upon said carrier having its discharge end positioned above said nip to discharge coating material along the length of the nip during movement of said carrier.'

8. A device for uniformly distributing a liquid coating suspension along the length of a nip between two gate rolls of a coating machine which comprises, a track disposed substantially parallel to the length of said gate rolls, an end less chain disposed adjacent said track and having two parallel passes disposed substantially parallel to said-track, wheels over which said chains are trained at the ends of said passes, a

carrier positioned upon said track for movement thereon, a lug carried by said chain, a pair of spaced forks upon said carrier for alternate engagement with said chain lug, said chain lug breaking engagement with one of said forks and making engagement with the other forks at the end of each pass whereby said carrier is moved forwardly and backwardly upon said track, and a coating material conduit mounted upon said carrier having its discharge end positioned above said nip to discharge coating material along the length of the nip during movement of said carrier.

9. A device for uniformly distributing a liquid 10 coating suspension along the length of a nip between two gate rolls of a coating machine which comprises, a track disposed substantially parallel to the length of said gate rolls, an endless chain disposed adjacent said track and having two parallel passes disposed substantially par-' allel to said track, wheels over which said chains are trained at the ends of said passes, a carrier positioned upon said track for movement there.-

' on, engaging means carried by said chain, a pair of spaced engaging means upon said carrier for alternate engagement with said chain engaging means, said chain engaging means breaking engagement with one of said carrier engaging means and making engagement with the other carrier engaging means at the end of each pass whereby said carrier is moved forwardly and backwardly upon said track, means for holding said carrier stationary during the period of disengagement and engagement of said chain engaging means, and a coating material conduit mounted upon said carrier having its discharge end positioned above said nip to discharge coating material along'the length of the nip during movement of said carrier.

'10. A device for uniformly distributing a liquid coating suspension along the length of a nip between two gate rolls of a coating machine which comprises, a track disposed substantially parallel to the length of said gate'rolls, an endless chain disposed adjacent said track and having two parallel passes disposed substantially parallel to said track, wheels over which said chains are trained at the ends of said passes, a carrier positioned upon said track for movement thereon, engaging means carried by said chain, a pair of spaced engaging means upon said carrier for alternate engagment with said chain engaging means, said chain engaging means breaking engagement with one of said carrier engaging means and makingengagement with the other carrier engaging means at the end of each pass whereby said carrier is moved forwardly and backwardly upon said track, magnetic means for holding said carrier stationary during the period of disengagement and engagement of said chain engaging means, and a coating material conduit,

. mounted upon said carrier having its discharge end positioned above said nip to discharge coating material along the length of the nip during movement of said carrier.

HOWARD B. RICHMOND. ROBERT W. MORTENSEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENT 

